Writing instrument



FIG. 1 is a perspective view of a writing instrument showing my new design;

FIG. 2 is a left side elevational view thereof, shown on an enlarged scale;

FIG. 3 is a right side elevational view thereof, shown on an enlarged scale;

FIG. 4 is a top plan view thereof; the bottom plan view being a mirror image of FIG. 4; and,

FIG. 5 is a front elevational view thereof; the rear elevational view being a mirror image of FIG. 5; and,

FIG. 6 is a perspective view of the writing instrument in an extended state. 

The ornamental design for a writing instrument, as shown and described. 